127 — 



Podospora setosa. 



One must consider P. setosa as a rare for Moscow form, for 

 during three years of investigation it was found only once. This 

 species is again interesting on account of its ascus, quite different 

 from the normal one; -it, as one is aware, contains 128 spores. It 

 is not necessary to describe in detail the development and structure 

 of the spiral coiled ascogonium, the cells of which give rise to the 

 ascogenous hyphae, for it would be the repetition of what was 

 already said for the former species. In the young ascogonium the 

 nuclei are few, 4 — 5, they are very small (fig. 31) and even later 

 do not attain such large dimensions as in the other described spe- 

 cies (fig. 32). On the same draAving we can see, that the nuclei 

 here are also lying, in certain places, in pairs. This pairing is 

 infringed in the ascogonium, which has begun" formation of the 

 ascogenous hyphae. In the latter the nuclei lying in pairs appear 

 again quite distinctly. 



Passing to the description of the development of the ascus, one 

 can state that after the usual formation of the 8 nuclei in the 

 ascus, they continue to divide and at the same time greatly dimi- 

 nish in size (fig. 33). Finally very small nuclei result, in great 

 quantity like small spots. They are so small that in greater part 

 the nucleolus in same cannot be distinguished (fig. 34). After some 

 time next to these nuclei begin to separate more dark portions of 

 dense protoplasm. The nuclei with such isolated portions of proto- 

 plasm take the shape of stretched out bodies and in such stage of 

 development occupy the polar position (fig. 35). During the growth 

 of the spores in the nuclei begins to come out distinctly the nucleolus 

 (fig. 36). The spores are disposed in this stage of development 

 always in somewhat awry position (fig. 37). Soon the nucleus pas- 

 ses into the centre of the spore and, as in the other species of 

 Podospora, one part of the spore swells and the other part forms 

 the appendage. 



In the cultures, not only the asci fruiting developed, but often 

 developed picnidia, similar in general features, to those described 

 by AVoronin for P. coprophila. 



